The DJ18 Subwoofer Monitor is the cornerstone of HSD’s performance monitoring solutions, delivering robust low-frequency output with precision and adaptability. Featuring an 18″ subwoofer equipped with a 4″ voice coil. Built to complement the Reference 12, the DJ18 is the ideal low-frequency foundation for audio systems that require precision and reliability. Featuring dual 12″ low-frequency drivers, four 6″ midrange transducers, and two 1.4″ compression drivers, the Ballista delivers high-output performance with exceptional mid-bass clarity and phenomenal off-axis coverage.